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How to dynamic hierarchical listview

To dynamic hierarchical listview, push the new list item data into the existing dataSource using the select event.

Refer to the following steps to load list item into the child list:

  1. Initially, render the ListView with the required data source.

  2. Bind the select event that triggers selecting list item in the ListView control. By using the select event, you can push the new list item to the child list of the data source on specifying its item index. Item index can be obtained from the SelectEventArgs of the select event.

Source
Preview
index.js
index.html
index.css
var dataSource = [
        {
            id: '01', text: 'Music', icon: 'folder',
            child: [
                { id: '01-01', text: 'Gouttes.mp3', icon: 'file' }
            ]
        },
        {
            id: '02', text: 'Videos', icon: 'folder',
            child: [
                { id: '02-01', text: 'Naturals.mp4', icon: 'file' },
                { id: '02-02', text: 'Wild.mpeg', icon: 'file' },
            ]
        },
        {
            id: '03', text: 'Documents', icon: 'folder',
            child: [
                { id: '03-01', text: 'Environment Pollution.docx', icon: 'file' },
                { id: '03-02', text: 'Global Water, Sanitation, & Hygiene.docx', icon: 'file' },
                { id: '03-03', text: 'Global Warming.ppt', icon: 'file' },
                { id: '03-04', text: 'Social Network.pdf', icon: 'file' },
                { id: '03-05', text: 'Youth Empowerment.pdf', icon: 'file' },
            ]
        },
        {
            id: '04', text: 'Pictures', icon: 'folder',
            child: [
                {
                    id: '04-01', text: 'Camera Roll', icon: 'folder',
                    child: [
                        { id: '04-01-01', text: 'WIN_20160726_094117.JPG', icon: 'file' },
                        { id: '04-01-02', text: 'WIN_20160726_094118.JPG', icon: 'file' },
                        { id: '04-01-03', text: 'WIN_20160726_094119.JPG', icon: 'file' }
                    ]
                },
                {
                    id: '04-02', text: 'Wind.jpg', icon: 'file'
                },
                {
                    id: '04-02', text: 'Stone.jpg', icon: 'file'
                },
                {
                    id: '04-02', text: 'Home.jpg', icon: 'file'
                },
                {
                    id: '04-02', text: 'Bridge.png', icon: 'file'
                }
            ]
        },
        {
            id: '05', text: 'Downloads', icon: 'folder',
            child: [
                { id: '05-01', text: 'UI-Guide.pdf', icon: 'file' },
                { id: '05-02', text: 'Tutorials.zip', icon: 'file' },
                { id: '05-03', text: 'Game.exe', icon: 'file' },
                { id: '05-04', text: 'TypeScript.7z', icon: 'file' },
            ]
        },
    ];
    //Initialize ListView component
    var listviewInstance = new ej.lists.ListView({
        //Set defined data to dataSource property
        dataSource: dataSource,
        //Map appropriate columns to fields property
        fields: { iconCss: 'icon', tooltip: 'text' },
        //Set true to show icons
        showIcon: true,
        //Set header title
        headerTitle: 'Folders',
        //Set true to show header title
        showHeader: true,
        //select event to add new list item in child page
        select: onSelect
    });
    //Render initialized ListView
    listviewInstance.appendTo("#listview");
    //select event to add new list item in child page
    function onSelect(args) {
        //add new file to the child page of selected list item
        this.dataSource[args.index].child.push({ id: '01-02', text: 'Newly Added File', icon: 'file', htmlAttributes: { role: 'li', class: 'list' } });
    }
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 for ListView </title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Essential JS 2 for ListView UI Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="listview"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  width: 30%;
  position: absolute;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  top: 45%;
  left: 45%;
}

#listview {
    display: block;
    max-width: 350px;
    margin: auto;
    border: 1px solid #dddddd;
    border-radius: 3px;
}


#listview.e-listview .e-list-icon {
    height: 24px;
    width: 30px;
}

.folder,.file  {
    background: url('//ej2.syncfusion.com/demos/src/listview/images/file_icons.png') no-repeat;
    background-size: 302%;
}

.folder{    
    background-position: -5px -466px;
}

.file {
    background-position: -5px -151px;
}
/* csslint ignore:start */

.list {
    color:deeppink !important;
}

/* csslint ignore:end */